Studies on Reaction Kinetics of LiOH for Absorbing CO2

A static method was employed to study the reaction kinetics of anhydrous lithium hydroxide (LiOH) and CO₂. At the reaction temperature of 15~60degC and initial CO₂ pressures of 25~100 kPa, the reaction rate of anhydrous LiOH and CO₂ decreased slightly with the reduction of initial CO₂ pressure and the rise of reaction temperature, indicating that the reaction activation energy of LiOH and CO₂ was negative and close to zero. During the middle period (1~5 min) of the isothermal reaction, the ratio of reaction efficiency was approximately the power of 0.4 to that of initial CO₂ pressures. As anhydrous LiOH reacted to CO₂, the solid product Li₂CO₃ covered on the surface of LiOH was not compact, so it didn´t hinder the subsequent reaction of absorbing the CO₂ gas. The reaction kinetics of anhydrous LiOH and CO₂ obeyed the Erofeev´s model.